Tractor.



A. L. ELLIS.-

TRACTOR.

APPLICATION FILED 1uLY'2\ I918.

Patented. Dec. 24, 1918.

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1 APPLlCATlON FILE-D JULY 2.19l8- a Patented Dec. 24,1918.

Fla 2 awe/v70 A. L ELL/5 less chains 0 Application filed 51113;23,

Fri/0L2) concern.

hat I, ALDEN L. ELLIS, Jnited States, residing at e county of Santa Clara rornia, have invented new and useful iniproeeinents in Tractors, of

which the following is 'a specification.

The present invention relates to improvements tr eters of the track-laying type.

@nc object of the invention is to provide a tractor having a track of such form and construction as to require no oil. When tracl; is oiled, the oil, mixing with the dirt, gravel and the like with which it comes into contact, forms greatly ahrades and injures the parts of the track with which. it comes in contact.

A further o oj ect isto provide in such a t ctor a tracl: which is self-cleaning.

further object is to--provide a tractor a will dis ense with the necessity of rierentiai at .011 on the opposite sides oi e tractor. s

ruction whereby the operat 111g mechanism ofythe tractor may be en- 1. U

' ireiy inclosecl, and greatly lengthening further inexpensive tractor.

in the acconi -sanying drawings, Figure l is a side elevation oi a portion of my improved tractor front portion thereof being omitted; 3 is a broken plan View oi the same; i Q 3, a, 5., 5, are transverse sections t lies 33, e e, 5-5, 6'6, respectively or Referring to ising its eiiiciency and drawing, 1 indicates end- 7 ds, one on each side of the tractor. Said chains are composed of links 2, each link comprising a plate 3 havi fi'g'at one end outward extending spaced knuckles 8 and at the oil knuckles 8 extending the full width of the plate and having integral therewith a central knuckle 6, through which and the knuckles 8 of an adjacent linkextends a pintle Said links 2 travel around, and support, front and rear sprocket wheels 13, each of which is formed sprocket teeth 14 in pairs, the sprocket teeth of each pair being on opposite sides the Wheel, shafts 16 extendi between the sprocket teeth of each a gritdike substance and A further ol ect of the invention is to as rendering it dust-proof end a housing 7 for said no; 24 H318,

' re 1?, said rollers engag ing m L the knuckle (ion the lines. Q; as sprocket "els are mounted on to, shai which surround, an. i are attached 1s i9, the ones oieach shaft being contained in tie recesses 21 of frames 22. Said frames are also SiyPQItECl upon rollers 23 which engage the links of the lower centrai nortions oi said endless chains.

trainee also bearings 24: for ends of transverse shaft 26, to the choral portion ofwhich is keyed, as shown at 2?, the. hub 28 of worin wheel 29 which s engaged by a worm. 31 on forwardly ex- "ending shaftrli the forward end of which .s connected with a transmission connected o the shaft of an internal combustion enthe transmission and engine of any .on construe .zot losing; hereshown.

casing which seeti ns 33 bolted to- 3%, supported by geezer, as shown hall bearings 36 upon the hub 28 or the wheel, said sections having lateral extensions 3'? which are secured, as shown at 38, to channel irons which support the seat ii. other portions of the tractor. in each extension 3? are contained sprocket wheels i2 also keyed to the shaft 26 and around said sprocket wheels travel sprocket chains which also travel around sprocket wheels 44- on the sleeves 18. 7

Thus by the rotation of said shaft 32 the heel 29 is also rotated, rotating the .t wheels i2, imparting rotation to eves 18 and thus to the driving t wheels 13, and thus causing the treads or endless chains to advance.

teeth or bosses of the track tend to rel are any dirt that might lodge between the teeth 14: of the sprocket wheels and the rollers 17, by pushing said. dirt between the opposite teeth of each pair between the main body or the wheel and the roller.

It wit be observed that, on account of the two tracks on opposite sides of the tractor being so close together, they act as a unit, so that no difi'erential action on the driving wheels is required to turn the tractor, but the tractor turns as if it were moving on a single track.

I claim:

1. A tractor he i Qpri j pai ing parallel with direction from opposite sides of the wheel,

rollers mounted between the ends of the sprocket'teeth of the several pairs, and endless tracks composed of links having bosses extending inwardly therefrom between successive rollers;

2. A tractor having sprocket wheels each comprising pairs of sprocket teeth extending parallel with each other in the same direction from opposite sides of the wheel,

rollers mounted between the ends of the sprocket teeth of the several pairs, and endless tracks composed of links having bosses extending inwardly therefrom between successive rollers and each having at one end a central knuckle engaging one of said rollers.

3. A tractor comprising a transverse shaft, means for rotating said shaft, sprocket wheels secured to said shaft on each side of its center and rotating therewith, sprocket chains around the respective sprocket wheels wheels.

4, A tractor comprising a transverse shaft, means for rotating said shaft, sprocket Wheels secured to said shaft on each side of its center, and sprocket chains around the respective sprocket wheels and extending forwardly and rearwarclly therefrom, driving wheels, shafts therefor, ends of which are supported in said frames and rotated by said sprocket chains, endless tracks around the driving wheels, and a casing fitted closely around said shafts and entirely inclosing the chains and the sprocket wheels around which they travel.

ALDEN L. ELLIS.

rotating therewith, 

